chore: regenerate README

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Log from Synthtool

2020-10-15 22:44:09,039 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-cloudbuild/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working directory clean
2020-10-15 22:44:09,996 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

Full log will be available here:
https://source.cloud.google.com/results/invocations/b3bba978-a6f8-4511-8dee-6efedf1e642f/targets

• To automatically regenerate this PR, check this box.

[codecov]

Codecov Report

Merging #285 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #285   +/-   ##
=========================================
  Coverage     81.69%   81.69%           
  Complexity      117      117           
=========================================
  Files             6        6           
  Lines           907      907           
  Branches          3        3           
=========================================
  Hits            741      741           
  Misses          163      163           
  Partials          3        3           

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